package com.itheima.interceptor;

import com.itheima.utils.CurrentHolder;
import com.itheima.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.plugin.Interceptor;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

@Slf4j
@Component
public class TokenInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        /*
        //1.获取到请求路径
        String requestURI = request.getRequestURI();
        //2.判断是否是登录请求，如果路径中包含/login，说明是登录请求，直接放行
        if (requestURI.contains("/login")){
            log.info("登录请求，放行");
            return true;
        }
        */
        //3.获取请求头中的token
        String token = request.getHeader("token");
        //4.判断token是否存在，如果不存在，说明用户没有登录，返回错误信息（响应401状态码）
        if (token == null||token.isEmpty()){
            log.info("令牌为空，响应401");
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return false;
        }
        //5.如果token存在，校验令牌，如果校验失败，返回错误信息（响应401状态码）
        try {
            Claims claims = JwtUtils.parseToken(token);
            Integer empId = Integer.valueOf(claims.get("id").toString());
            CurrentHolder.setCurrentId(empId);
            log.info("当前登录员工ID:{}",empId);
        } catch (Exception e) {
            log.info("令牌非法，响应401");
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return false;
        }
        //6.校验通过，放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        CurrentHolder.remove();
        log.debug("已清理当前线程中的 empId");
    }
}
